Solid–Liquid Phase Equilibrium in the Ternary Systems (Li2B4O7 + MgB4O7 + H2O) and (Na2B4O7 + MgB4O7 + H2O) at 298.15 K

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• 作者：Shiqiang WangXuemin Du ; Yan Jing ; Yafei Guo ; Tianlong Deng
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2017
• 出版时间：January 12, 2017
• 年：2017
• 卷：62
• 期：1
• 页码：253-258
• 全文大小：441K
• ISSN：1520-5134

文摘

Solid–liquid phase equilibria of the two ternary systems (Li₂B₄O₇ + MgB₄O₇ + H₂O) and (Na₂B₄O₇ + MgB₄O₇ + H₂O) at T = 298.15 K and p = 0.1 MPa were studied with the isothermal dissolution equilibrium method. Solubilities, densities, pH values, and refractive indices were measured experimentally. In the ternary system (Li₂B₄O₇ + MgB₄O₇ + H₂O) at 298.15 K, there are one invariant point corresponding to (Li₂B₄O₇·3H₂O + MgB₄O₇·9H₂O), two isothermal dissolution curves, and two crystallization regions. The crystallized area of MgB₄O₇·9H₂O is increased obviously with the increase of temperature, while that of Li₂B₄O₇·3H₂O is decreased slightly. In the ternary system (Na₂B₄O₇ + MgB₄O₇ + H₂O) at 298.15 K, there are one invariant point (Na₂B₄O₇·10H₂O + MgB₄O₇·9H₂O), two isothermal dissolution curves, and two crystallization regions. The crystallized area of MgB₄O₇·9H₂O is increased with the increase of temperature, while that of Na₂B₄O₇·10H₂O is decreased obviously. Both of the systems belong to a simple eutectic type, and neither double salts nor solid solutions formed.